?I. Does galvanized pipe have corrosion resistance?

The simple answer is: Yes, it has some corrosion resistance, but its ability is limited and it's not a long-term solution.

Galvanized pipe (usually referring to hot-dip galvanized steel pipe) is made by coating ordinary steel pipe with a dense layer of zinc. Zinc is more corrosion-resistant than iron, and this zinc layer has two functions:

1. Physical barrier function: It isolates the steel substrate from the corrosive environment (such as water and air).

2. Electrochemical protection function (sacrificial anode): When the zinc layer is damaged, zinc acts as a "sacrificial anode" and is preferentially corroded, thus protecting the internal steel substrate from corrosion. This is why galvanized pipe is much more corrosion-resistant than ordinary black steel pipe (ungalvanized).

However, galvanized pipe has its obvious limitations:

The zinc layer will be consumed: Over time, the zinc layer will gradually corrode away. Once the zinc layer is completely consumed, the internal steel will begin to rust, and the corrosion rate will accelerate.

**Intolerant to Specific Corrosion:** Zinc layers corrode rapidly in highly acidic or alkaline water, or in soft water (high in carbon dioxide, easily forming carbonate corrosion).

**White Rust Problem:** In humid, poorly ventilated environments, a loose "white rust" (basic zinc carbonate) forms on the zinc surface, accelerating corrosion.

**Historical Lessons:** In the past, galvanized water pipes widely used in buildings commonly developed severe internal corrosion and scaling after 5-10 years, leading to yellowing water ("yellow water") and reduced flow. Therefore, the use of galvanized pipes in civil building water supply systems is now strictly prohibited.

**Conclusion:** Galvanized pipes provide short- to medium-term corrosion protection and are suitable for structural components with low lifespan requirements or non-critical water supply applications, but they should not be the first choice for long-term corrosion-resistant pipes.

?II. What Pipes Have Corrosion Resistance?

Many types of pipes truly possess excellent corrosion resistance, achieving this through different materials and technologies. The main categories are as follows:

Selection Recommendations: The choice of which type of corrosion-resistant pipe to use depends on a comprehensive consideration of the chemical properties of the transported medium, temperature, pressure, cost budget, and service life requirements.

? III. Advantages of Using Corrosion-Resistant Repair Parts

When the aforementioned corrosion-resistant pipes leak, using matching corrosion-resistant repair parts is crucial. The advantages are mainly reflected in:

1. High Material Compatibility, Avoiding Galvanic Corrosion

Key Advantage: If ordinary carbon steel repair parts (such as ordinary leak repair clamps) are used to repair stainless steel or copper pipes, the contact between the two different metals in the electrolyte (water) will form a "galvanic cell," accelerating the corrosion of the more reactive metal (usually carbon steel). This is called galvanic corrosion. Using corrosion-resistant repair parts that are the same as or compatible with the pipe material (such as stainless steel repair parts for stainless steel pipes) can completely avoid this problem, ensuring that the repair point does not become a new weak point for corrosion.

2. Ensuring the Integrity of the System After Repair

The corrosion-resistant repair parts themselves have a service life that matches the pipeline. If a pipeline has a 50-year lifespan, but a repair kit rusts through after only 10 years, it means another repair is needed. Using corrosion-resistant repair kits ensures that the repaired pipeline system maintains consistent corrosion resistance, preserving the system's overall design life.

3. Maintaining Media Purity

For pipelines transporting drinking water, chemicals, and high-purity water, the corrosion resistance of repair kits is crucial. If repair kits corrode, rust products will contaminate the media, leading to substandard water quality or product failure. Corrosion-resistant repair kits ensure the purity of the transported media.

4. Wide Applicability

Repair kits specifically designed for extreme corrosive environments such as chemical plants and marine environments (e.g., high-performance epoxy coatings, all-plastic or all-stainless steel materials) can handle harsh conditions that ordinary repair kits cannot.

5. Reduced Life Cycle Costs

Although the initial purchase cost of corrosion-resistant repair kits may be higher than that of ordinary products, they avoid the repeated repair costs, downtime losses, and potential environmental pollution cleanup costs caused by secondary corrosion leaks. From a life cycle perspective, the total cost is lower.

The housing is typically made of metals such as ductile iron and carbon steel, which are corrosion-resistant and high-strength. It can last the same life as the original pipe, eliminating the need for frequent repairs. Baoshuo brand carbon steel half joints are available in a variety of rubber materials, including NBR, EPDM, FKM, and silicone rubber. The half joint body is available in Q235 carbon steel and 304 and 316L stainless steel.

The following are Baoshuo brand oil-resistant pipe repair clamps, high-temperature-resistant pipe repair clamps, acid- and alkali-resistant pipe repair clamps, stainless steel pipe repair clamps, high-pressure-resistant pipe repair clamps, and large-diameter pipe repair clamps.

Summary:

Galvanized pipes have limited corrosion resistance and are not recommended for long-term, critical water supply systems.

There are many types of corrosion-resistant pipes; the appropriate type (plastic, composite, such as fiberglass, or stainless steel) should be selected based on specific working conditions.

When repairing pipes, selecting corrosion-resistant repair parts compatible with the main pipe material is a crucial decision for ensuring repair quality, avoiding secondary damage, and extending the overall lifespan of the system.